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Lake Travis - Status - Wind Scale Info

Original from wikipedia.org Beaufort scale and slightly edited here for better fit into small screens.

(More on wind also at swedeteam.com/wind/)

B=Beaufort number

B Description Wind speed Wave height Sea conditions Land conditions Sea state photo Associated warning flag
0 Calm < 1 knot ft Sea like a mirror Smoke rises vertically. Beaufort scale 0.jpg
< 1 mph
< 2 km/h m
< 0.5 m/s
1 Light air 1–3 knots 0–1 ft Ripples with appearance of scales are formed, without foam crests Direction shown by smoke drift but not by wind vanes. Beaufort scale 1.jpg
1–3 mph
2–5 km/h 0–0.3 m
0.5–1.5 m/s
2 Light breeze 4–6 knots 1–2 ft Small wavelets still short but more pronounced; crests have a glassy appearance but do not break Wind felt on face; leaves rustle; wind vane moved by wind. Beaufort scale 2.jpg
4–7 mph
6–11 km/h 0.3–0.6 m
1.6–3.3 m/s
3 Gentle breeze 7–10 knots 2–4 ft Large wavelets; crests begin to break; foam of glassy appearance; perhaps scattered white horses Leaves and small twigs in constant motion; light flags extended. Beaufort scale 3.jpg
8–12 mph
12–19 km/h 0.6–1.2 m
3.4–5.5 m/s
4 Moderate breeze 11–16 knots 3.5–6 ft Small waves becoming longer; fairly frequent white horses Raises dust and loose paper; small branches moved. Beaufort scale 4.jpg
13–18 mph
20–28 km/h 1–2 m
5.5–7.9 m/s
5 Fresh breeze 17–21 knots 6–10 ft Moderate waves taking a more pronounced long form; many white horses are formed; chance of some spray Small trees in leaf begin to sway; crested wavelets form on inland waters. Beaufort scale 5.jpg
19–24 mph
29–38 km/h 2–3 m
8–10.7 m/s
6 Strong breeze 22–27 knots 9–13 ft Large waves begin to form; the white foam crests are more extensive everywhere; probably some spray Large branches in motion; whistling heard in telegraph wires; umbrellas used with difficulty. Beaufort scale 6.jpg Gale pennant.svg
25–31 mph
39–49 km/h 3–4 m
10.8–13.8 m/s
7 High wind,
moderate gale,
near gale
28–33 knots 13–19 ft Sea heaps up and white foam from breaking waves begins to be blown in streaks along the direction of the wind; spindrift begins to be seen Whole trees in motion; inconvenience felt when walking against the wind. Beaufort scale 7.jpg Gale pennant.svg
32–38 mph
50–61 km/h 4–5.5 m
13.9–17.1 m/s
8 Gale,
fresh gale
34–40 knots 18–25 ft Moderately high waves of greater length; edges of crests break into spindrift; foam is blown in well-marked streaks along the direction of the wind Twigs break off trees; generally impedes progress. Beaufort scale 8.jpg Gale pennant.svg
Gale pennant.svg
39–46 mph
62–74 km/h 5.5–7.5 m
17.2–20.7 m/s
9 Strong / severe gale 41–47 knots 23–32 ft High waves; dense streaks of foam along the direction of the wind; sea begins to roll; spray affects visibility Slight structural damage (chimney pots and slates removed). Beaufort scale 9.jpg Gale pennant.svg
Gale pennant.svg
47–54 mph
75–88 km/h 7–10 m
20.8–24.4 m/s
10 Storm,
whole gale
48–55 knots 29–41 ft Very high waves with long overhanging crests; resulting foam in great patches is blown in dense white streaks along the direction of the wind; on the whole the surface of the sea takes on a white appearance; rolling of the sea becomes heavy; visibility affected Seldom experienced inland; trees uprooted; considerable structural damage. Beaufort scale 10.jpg Storm warning.svg
55–63 mph
89–102 km/h 9–12.5 m
24.5–28.4 m/s
11 Violent storm 56–63 knots 37–52 ft Exceptionally high waves; small- and medium-sized ships might be for a long time lost to view behind the waves; sea is covered with long white patches of foam; everywhere the edges of the wave crests are blown into foam; visibility affected Very rarely experienced; accompanied by widespread damage. Beaufort scale 11.jpg Storm warning.svg
64–72 mph
103–117 km/h 11.5–16 m
28.5–32.6 m/s
12 Hurricane force [7] ≥ 64 knots ≥ 46 ft The air is filled with foam and spray; sea is completely white with driving spray; visibility very seriously affected Devastation. Beaufort scale 12.jpg Storm warning.svg

Storm warning.svg
≥ 73 mph
≥ 118 km/h ≥ 14 m
≥ 32.7 m/s
References: Met Office,[8] Royal Meteorological Society,[9] Encyclopædia Britannica[10]

 

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